Why the same plate lands differently in two bodies.
How fast you turn carbohydrates into blood sugar is partly genetic, shaped by genes like AMY1 and TCF7L2 that vary a lot between people in the same family.
Because most Indian adults stop making the enzyme that digests milk sugar after childhood - only around one in eight carries the variant for lifelong tolerance.
Probably not - most people absorb only some of what they take, and which ones depend on genes like MTHFR for B12 and VDR for vitamin D.
The FTO gene influences appetite and how your body responds to high-carbohydrate diets, so the same eating pattern can drive weight gain in one person and not another.